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Bigfin squid
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{{short description|Genus (Magnapinna) of Cephalopoda}} {{use dmy dates|date=February 2023}} {{Distinguish|Bigfin reef squid}} {{Automatic taxobox | name = Bigfin squid | image = LongArmSquid.jpg | image_caption = A bigfin squid filmed in 2001,<br />possibly an adult ''Magnapinna'' sp. | parent_authority = [[Michael Vecchione|Vecchione]] & [[Richard E. Young|Young]], 1998 | display_parents = 2 | taxon = Magnapinna | authority = [[Michael Vecchione|Vecchione]] & [[Richard E. Young|Young]], 1998<ref name = WoRMS>{{cite web |url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=341442 |title=''Magnapinna'' Vecchione & Young, 1998 |access-date=9 March 2018 |publisher=[[Flanders Marine Institute]] |year=2016 |first=Julian|last=Finn |work=[[World Register of Marine Species]]}}</ref> | type_species = ''Magnapinna pacifica'' | type_species_authority = Vecchione & Young, 1998 | subdivision_ranks = Species | subdivision = *''[[Magnapinna atlantica]]'' <small>Vecchione & Young, 2006</small> *''[[Magnapinna pacifica]]'' <small>Vecchione & Young, 1998</small> *''[[Magnapinna talismani]]'' <small>({{ill|Pierre Marie Henri Fischer|lt=Fischer|qid=Q21338146|s=1|v=sup}} & [[Louis Joubin|Joubin]], 1907)</small> *[[Magnapinna sp. B|''Magnapinna'' sp. B]] *[[Magnapinna sp. C|''Magnapinna'' sp. C]] }} '''Bigfin squids''' are a group of rarely seen [[cephalopod]]s with a distinctive [[Morphology (biology)|morphology]]. They are placed in the [[genus]] '''''Magnapinna''''' and [[family (biology)|family]] '''Magnapinnidae'''.<ref>{{Cite web |url=https://eol.org/pages/3020457 |title=Magnapinna Vecchione & Young 1998 - Encyclopedia of Life |website=eol.org |access-date=2019-03-24}}</ref> Although the family was described only from larval, [[paralarva]]l, and juvenile specimens, numerous video observations of much larger squid with similar morphology are assumed to be adult specimens of the same family.<ref name=":2">{{Cite web |last1=Vecchione |first1=Michael |last2=Young |first2=Richard E. |date=29 August 2016 |title=Magnapinna |url=http://tolweb.org/tree?group=Magnapinnidae |access-date=5 April 2023 |website=Tree of Life Web Project}}</ref> The arms and tentacles of the squid are both extremely long, estimated at {{convert|4|to|8|m|ft|abbr=on}}. These appendages are held perpendicular to the body, creating "elbows". How the squid feeds is yet to be discovered.<ref name="Osterhage2020">{{Cite journal |title=Multiple observations of Bigfin Squid (Magnapinna sp.) in the Great Australian Bight reveal distribution patterns, morphological characteristics, and rarely seen behaviour |first1=Deborah |last1=Osterhage |first2=Hugh |last2=MacIntosh |first3=Franziska |last3=Althaus |first4=Andrew |last4=Ross |date=November 11, 2020 |journal=PLOS ONE |volume=15 |issue=11 |pages=e0241066 |doi=10.1371/journal.pone.0241066 |pmid=33175888 |pmc=7657483 |bibcode=2020PLoSO..1541066O |doi-access=free}}</ref> ''Magnapinna'' is thought to be the deepest-occurring squid genus, with sightings as deep as {{Convert|6212|m|ft}} below the surface, making it the only squid known to inhabit the [[hadal zone]].<ref name=":1">{{Cite journal |last1=Jamieson |first1=Alan J. |last2=Vecchione |first2=Michael |date=2021-12-02 |title=Hadal cephalopods: first squid observation (Oegopsida, Magnapinnidae, Magnapinna sp.) and new records of finned octopods (Cirrata) at depths > 6000 m in the Philippine Trench |url=https://doi.org/10.1007/s00227-021-03993-x |journal=Marine Biology |language=en |volume=169 |issue=1 |pages=11 |doi=10.1007/s00227-021-03993-x |s2cid=244857743 |issn=1432-1793}}</ref><ref name=":5">{{Cite web |last=Specktor |first=Brandon |date=2022-01-18 |title=World's deepest-dwelling squid spotted 20,000 feet under the sea |url=https://www.livescience.com/worlds-deepest-squid-philippine-trench |access-date=2023-06-27 |website=livescience.com |language=en}}</ref>
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